Which is not a function of cell membrane proteins?
contain marker molecules to recognize self cells
to act as the skeleton of the cell
serve as ion channels
act as carrier proteins
The Correct Answer is B
A. contain marker molecules to recognize self cells: Glycoproteins serve as cell identity markers to help the immune system distinguish “self” from “non-self.”
B. to act as the skeleton of the cell: The cytoskeleton, not membrane proteins, acts as the structural support inside the cell.
C. serve as ion channels: Membrane proteins act as channels to allow specific ions to pass through the membrane.
D. act as carrier proteins: Carrier proteins help transport substances across the membrane, often against a concentration gradient.
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Related Questions
Correct Answer is D
Explanation
A. Urinary – Includes kidney & bladder; removes wastes: The urinary system includes the kidneys and bladder, which remove nitrogenous waste and regulate water and electrolyte balance.
B. Endocrine – Includes the hormone-producing glands: The endocrine system includes pituitary, thyroid, adrenal glands, etc., involved in metabolism, growth, and reproduction.
C. Respiratory – Includes lungs, involved in gas exchange & pH balance: The lungs are central to the exchange of O₂ and CO₂, which also helps regulate blood pH.
D. Digestive – Includes blood vessels, transports nutrients and gases to organs and wastes (CO2) from organs: Blood vessels are primarily part of the circulatory system, not the digestive system. The digestive system includes the mouth, esophagus, stomach, intestines, liver, pancreas, etc., which process food and absorb nutrients-not gas transport.
Correct Answer is B
Explanation
A. a decrease in heart rate: Low oxygen usually triggers the body to increase heart rate to deliver more oxygen-not decrease it.
B. an increase in the respiratory rate: In negative feedback, low oxygen stimulates chemoreceptors which trigger an increase in respiratory rate to bring in more oxygen.
C. a decrease in the respiratory rate: This would worsen the low oxygen state, and is contrary to how the body responds.
D. A and C: Both options are inappropriate responses to low oxygen levels.
E. A and B: While B is correct, A is not, so this combination is also incorrect.
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